Process for the preparation of polyethylenes

    公开(公告)号:US11952440B2

    公开(公告)日:2024-04-09

    申请号:US17285958

    申请日:2019-10-17

    Abstract: The present invention relates to a process for the production of a polyethylene by polymerisation of a reaction mixture comprising ethylene in the presence a catalyst system and an antistatic agent according to formula I: (I) wherein R1, R2 and R3 stand for a moiety according to formula II or a hydrocarbon moiety having 1 to 20 carbon atoms (II) wherein each of R4, R5 and R6 may be the same or different, and wherein each of R4, R5 and R6 is a hydrocarbon moiety having 1 to 10 carbon atoms, and wherein at least one of R1, R2 and R3 is a moiety according to formula II. Such process allows for the reduction of sheeting in the polymerisation reactor without compromising the polymerisation reaction kinetics.

    OLEFIN POLYMERISATION CATALYST AND PROCESS FOR MANUFACTURING THEREOF

    公开(公告)号:US20240343842A1

    公开(公告)日:2024-10-17

    申请号:US18682030

    申请日:2022-07-19

    CPC classification number: C08F4/65925 C08F4/025 C08F4/6428

    Abstract: Process for producing a supported metallocene catalyst system includes: (i) preparing mixture (a) by mixing a metallocene with a cocatalyst; (ii) preparing mixture (b) by reacting an aluminium (II) with an amine (III)t;




    wherein each R6 and R10 is hydrogen or a C1-30 hydrocarbon; R7, R8, and R11 are C1-30 hydrocarbon; R9 is hydrogen or a functional moiety comprising at least one active hydrogen; (iii) providing a support material, into a reaction vessel; (iv) providing a solvent into the reaction vessel; (v) supplying mixture (a) and mixture (b) to the reaction vessel; (vi) subjecting the contents of the reaction vessel to a temperature of >60° C. for a period of >3 hrs to obtain a supported catalyst system; and (vii) removing the solvent from the supported catalyst system. Such process allows for the production of a supported metallocene catalyst system having reduced fouling in olefin polymerisation.

    ETHYLENE-A-OLEFIN COPOLYMER AND PROCESS FOR MANUFACTURING THEREOF

    公开(公告)号:US20240262946A1

    公开(公告)日:2024-08-08

    申请号:US18565730

    申请日:2022-05-23

    CPC classification number: C08F210/16

    Abstract: An ethylene-α-olefin copolymer includes moieties derived from ethylene and moieties derived from an α-olefin comprising 3 to 10 carbon atoms, wherein the copolymer has: a short chain branching ratio (SCBR) of >1.40;



    a short chain branching content of ≥15.0/1000 C; a molecular weight distribution Mw/Mn of ≥10.0; and a quantity of polymer moieties derived from an α-olefin comprising 3 to 10 carbon atoms of ≥1.0 and ≤20.0 wt %, with regard to the total weight of the copolymer. Such copolymer demonstrates improved melt processability, as well as allows for manufacturing of films having desirable mechanical properties, in particular in production of films such as by blown film production or by cast film production.

Patent Agency Ranking